How to change a green bottle gas grill to a 20 pound bottle

Extend a stay will work provided you have an RV close by. All you need is a hose made specifically for this. Obviously Camping World has them but I have seen them elsewhere was well

It's called 'Extend-A-Stay'. We've always used a bigger propane tank. Less costly and more convenient.

This may work.

Hose

OR

Male at tank

You can purchase a hosed made specifically for that. Check Amazon and most RV supply stores.